Order Small if you are under 5'4" and under 120 lbs
Order Medium if you are under 5'6" and under 150 lbs but larger than size Small
Order Medium-Large if you are under 5'10" and under 175 lbs but larger than size Medium
Order Large if you are under 6' and under 200 lbs but larger than size Medium-Large
Order Extra Large if you are over 6' and over 200 lbs.
 
3mm nylon two side neoprene
grippy skin rubber on shockcord casing
1/4" adjustable bungee around base
1" nylon webbing adjuster straps over shoulders
velcro cinches at wrists